Checkpoint.
Update for v24.  Drop support for non-nil pop-up-frames.
Update README for 2.02.
New screenshots.
Markup tweaks.
Improved screenshot cropping.
Add advice around select-window to capture some new buffers
(window-configuration-change-hook is now getting run before windows are
selected in some functions, e.g., find-file).
Version bump: 2.03.
Remove now unnecessary dance when deactivating mode with an open buffer menu.
Minor code tweak.
Buffer-menu--unmark:  Remove update of of read-only bit.
Bump verison number.
Typos and whitespace cleanup.